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Lightning struck Plymouth in a spectacular storm in May 2017 (Image: Jim Merry)

Bonnie Diamond from the Met Office said: "At the moment we're looking at the thunderstorms regionally, so to actually pinpoint a place in a small area, we wouldn't have a lot of confidence in doing that.

"It does look like Friday afternoon southern parts of Cornwall will see some showers.

"Saturday afternoon and late evening is the main risk.

"The band of heavy rain looks like it will affect Cornwall and Western parts of Devon. They look to be most at risk of that, but it could be changable.

"The Sunday looks to be more isolated, in between the showers, there will be sunshine and warm weather."